WCDMA Primary Scrambling Codes PlanningISSUE 1.0 Huawei Confidential. All Rights Reserved Object Upon completion this course, you will be able to: Understand the principles for cell primary scrambling codes planning in WCDMA network Understand how to plan the cell primary scrambling codes (PSC) 2 Internal Use Chapter 1 WCDMA PSCs Chapter 2 WCDMA PSC palnning prinpicle Chapter 3 WCDMA PSC palnning method Chapter 4 WCDMA PSC planning case 3 Internal Use WCDMA Scrambling Codes Scrambling codes introduction GOLD sequence. 10ms ,or 38400 chips. Uplink scrambling codes The codes which are used for scrambling the uplink physical channels can be either long or short type. 24 24 2 long and 2 short uplink scrambling codes. Uplink scrambling codes are assigned by higher layers. Because uplink scrambling codes with a great number are allocated by RNC, we do not give our attention for that Uplink scrambling codes are used to distinguish different UEs 4 Internal Use WCDMA Scrambling Codes Downlink scrambling codes 18 For downlink physical channels, a total of 2 -1 = 262,143 scrambling codes can be generated. Only scrambling codes k = 0, 1, …, 8191 are used. 8192 codes are divided into 512 groups, each of which contains 16 scrambling codes. The first scrambling code of each group is called primary scrambling code (PSC), and the other 15 ones are secondary scrambling codes (SSC). The 512 PSCs are also divided into 64 groups, each of which contains 8 PSCs. Downlink PSC is used to distinguish the different cells. It has to be considered carefully 5 Internal Use Downlink Scrambling Codes Primary scrambling code 0 Secondary scrambling code 1 Set 0 Scrambling codes for downlink physical channels Set 1 …… Secondary scrambling code 15 … Primary scrambling code 511×16 Set 511 …… 8192 scrambling codes 512 sets Secondary scrambling code 511×16＋15 A primary scrambling code and 15 secondary scrambling codes are included in a set. Internal Use 6 Downlink Primary Scrambling Code Groups Primary scrambling code 0 Primary scrambling code 1 Group 0 Primary scrambling codes for downlink physical channels …… Primary scrambling code 7 Groupe1 … Primary scrambling code 8*63 Group 63 …… Primary scrambling code 63*8＋7 512 primary scrambling codes 64 primary scrambling code groups Each group consists of 8 primary scrambling codes Internal Use 7 Downlink Primary Scrambling Codes 主扰码 /组 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 PSC_1 PSC_2 PSC_3 PSC_4 PSC_5 PSC_6 0 16 32 48 64 80 128 144 160 176 192 208 256 272 288 304 320 336 384 400 416 432 448 464 512 528 544 560 576 592 640 656 672 688 704 720 768 784 800 816 832 848 896 912 928 944 960 976 1024 1040 1056 1072 1088 1104 1152 1168 1184 1200 1216 1232 1280 1296 1312 1328 1344 1360 1408 1424 1440 1456 1472 1488 1536 1552 1568 1584 1600 1616 1664 1680 1696 1712 1728 1744 1792 1808 1824 1840 1856 1872 1920 1936 1952 1968 1984 2000 PSC_7 PSC_8 96 112 224 240 352 368 480 496 608 624 736 752 864 880 992 1008 1120 1136 1248 1264 1376 1392 1504 1520 1632 1648 1760 1776 1888 1904 2016 2032 16 2048 2064 2080 2096 2112 2128 2144 2160 17 2176 2192 2208 2224 2240 2256 2272 2288 18 2304 2320 2336 2352 2368 2384 2400 2416 19 2432 2448 2464 2480 2496 2512 2528 2544 20 2560 2576 2592 2608 2624 2640 2656 2672 21 2688 2704 2720 2736 2752 2768 2784 2800 22 2816 2832 2848 2864 2880 2896 2912 2928 23 2944 2960 2976 2992 3008 3024 3040 3056 24 3072 3088 3104 3120 3136 3152 3168 3184 25 3200 3216 3232 3248 3264 3280 3296 3312 26 3328 3344 3360 3376 3392 3408 3424 3440 27 3456 3472 3488 3504 3520 3536 3552 3568 28 3584 3600 3616 3632 3648 3664 3680 3696 29 3712 3728 3744 3760 3776 3792 3808 3824 30 3840 3856 3872 3888 3904 3920 3936 3952 31 3968 3984 4000 4016 4032 4048 4064 4080 8 Internal Use Downlink Primary Scrambling Codes 32 4096 4112 4128 33 4224 4240 4256 34 4352 4368 4384 35 4480 4496 4512 36 4608 4624 4640 37 4736 4752 4768 38 4864 4880 4896 39 4992 5008 5024 40 5120 5136 5152 41 5248 5264 5280 42 5376 5392 5408 43 5504 5520 5536 44 5632 5648 5664 45 5760 5776 5792 46 5888 5904 5920 47 6016 6032 6048 4144 4160 4176 4192 4208 4272 4288 4304 4320 4336 4400 4416 4432 4448 4464 4528 4544 4560 4576 4592 4656 4672 4688 4704 4720 4784 4800 4816 4832 4848 4912 4928 4944 4960 4976 5040 5056 5072 5088 5104 5168 5184 5200 5216 5232 5296 5312 5328 5344 5360 5424 5440 5456 5472 5488 5552 5568 5584 5600 5616 5680 5696 5712 5728 5744 5808 5824 5840 5856 5872 5936 5952 5968 5984 6000 6064 6080 6096 6112 6128 48 6144 6160 6176 6192 6208 6224 6240 49 6272 6288 6304 6320 6336 6352 6368 50 6400 6416 6432 6448 6464 6480 6496 51 6528 6544 6560 6576 6592 6608 6624 52 6656 6672 6688 6704 6720 6736 6752 53 6784 6800 6816 6832 6848 6864 6880 54 6912 6928 6944 6960 6976 6992 7008 55 7040 7056 7072 7088 7104 7120 7136 56 7168 7184 7200 7216 7232 7248 7264 57 7296 7312 7328 7344 7360 7376 7392 58 7424 7440 7456 7472 7488 7504 7520 59 7552 7568 7584 7600 7616 7632 7648 60 7680 7696 7712 7728 7744 7760 7776 61 7808 7824 7840 7856 7872 7888 7904 62 7936 7952 7968 7984 8000 8016 8032 63 8064 8080 8096 8112 8128 8144 8160 6256 6384 6512 6640 6768 6896 7024 7152 7280 7408 7536 7664 7792 7920 8048 8176 9 Internal Use Chapter 1 WCDMA PSCs Chapter 2 WCDMA PSC palnning prinpicle Chapter 3 WCDMA PSC palnning method Chapter 4 WCDMA PSC planning case 10 Internal Use WCDMA PSCs planning principle Principle ： The intra-frequency other cells can not use the same PSC as the primary cell because of the interference! Which cells are included in the intra-frequency other cells? - Adjacent cell - Neighboring cell 11 Internal Use WCDMA PSCs planning principle What is adjacent cell ? The adjacent cells can interfere with the primary cell What is neighboring cell ? Adjacent cells of a primary cell already include neighboring cells. In terms of primary cell, it can receive pilot signals from other intra-frequency cells at the border of the cell. These pilot signals may be stronger or weaker than that of UE access level. If the pilot signal at the border of the primary cell is stronger than that of UE access level, this cell is (or probably is) the neighboring cell of the primary cell. 12 Internal Use WCDMA PSCs planning principle What is non neighboring cell ? These cells without interference to the primary cell are regarded as non neighboring cells, which can use the same PSCs as this primary cell 13 Internal Use Chapter 1 WCDMA PSCs Chapter 2 WCDMA PSC palnning prinpicle Chapter 3 WCDMA PSC palnning method Chapter 4 WCDMA PSC planning case 14 Internal Use WCDMA PSC palnning method The cell PSCs can be planned by either of the following two methods: Primary cell uses different PSCs from the neighboring cells, with the PSCs of the primary cell and those of the neighboring cells belonging to the same scrambling code group. Primary cell uses different PSCs from the neighboring cells, with the PSCs of the primary cell and those of the neighboring cells belonging to different scrambling code groups. NOW THE LATTER IS RECOMMANDED 15 Internal Use Chapter 1 WCDMA PSCs Chapter 2 WCDMA PSC palnning prinpicle Chapter 3 WCDMA PSC palnning method Chapter 4 WCDMA PSC planning case 16 Internal Use WCDMA PSC planning case In general, one site can support 3 intra-cells in actual network. So one PSCs group can be divided into (8 PSCs every group) 2 subgroups (4 PSCs every subgroup) 512 PSCs can be divide into 128 subgroups. The first PSC that stands for the subgroup should take part in the site PSC planning, the other PSCs of the subgroup are allocated to the cells of this site. We must remain partially PSCs in order to network evolution. 17 Internal Use WCDMA PSC planning case 18 Internal Use WCDMA PSC planning case 19 Internal Use WCDMA PSC planning case 20 Internal Use WCDMA PSC planning case 0# PSC is allocated site 0,so 1, 2 and 3# PSC is allocated site 0,too. site 0 has three cells, then allocate three 0,1,2#PSC to three cells and 3# PSC is remained to add a new cell. recommend to use the remained PSC when add a new cell . If we 21 Internal Use 22 Internal Use